CVE-2026-44327: free5GC is an open-source implementation of the 5G core network

Q: How do I fix CVE-2026-44327?

free5gc: upgrade to 4.2.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-44327 being exploited?

CVE-2026-44327 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-44327 affect?

CVE-2026-44327 affects free5gc. Severity is critical (CVSS 10.0). free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-oam route group without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can hit the OA

Q: How urgent is CVE-2026-44327?

Priority 51/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 10.0REMOTEUPGRADE

CVE-2026-44327 is a critical-severity flaw (CVSS 10.0) affecting free5gc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-oam route group without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can hit the OAM route with no Authorization header at all and the handler returns 200 OK. The current OAM handler is a stub that returns null, but the structural defect is route-group-scoped: the entire OAM route group has n

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-306, CWE-862
Published	2026-05-27
Last modified	2026-10-14

Publisher (CNA): GitHub, Inc. · Vendor: free5gc

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-27 17:16 UTCPublished CVE record published
2026-10-14 20:10 UTCUpdated Record last modified

free5gc free5gc UPGRADE

Affected: < 4.2.2

Fixed in: 4.2.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy free5gc || rpm -q free5gc || free5gc --version

2. UPGRADE to 4.2.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade free5gc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade free5gc

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-44327?

free5gc: upgrade to 4.2.2. Exact commands for each OS are on this page.

Is CVE-2026-44327 being exploited?

CVE-2026-44327 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-44327 affect?

CVE-2026-44327 affects free5gc. Severity is critical (CVSS 10.0). free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-oam route group without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can hit the OA

How urgent is CVE-2026-44327?

Priority 51/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

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CVE-2026-41135 HIGH 7.5 UPGRADE UPGRADE free5GC UDR is the Policy Control Function (PCF) for free5GC, an an open-source project for 5th generation (5G
CVE-2026-41136 MEDIUM 5.3 UPGRADE UPGRADE free5GC AMF provides Access & Mobility Management Function (AMF) for free5GC, an an open-source project for 5t
CVE-2026-44329 CRITICAL 10.0 UPGRADE free5GC is an open-source implementation of the 5G core network
CVE-2026-44330 CRITICAL 10.0 UPGRADE free5GC is an open-source implementation of the 5G core network

References

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